this fight for him straight to the floor for the united states senate. reporter: her current strategy is to moderate scott brown to conservative positions, casting him as too extreme for massachusetts voters. >> scott brown's best hope is to steer clear of this. reporter: he dropped in for a single day, refusing a single slot. on the campaign trail, you will rarely hear him utter the word republican. >> scott brown, republican -- how many times have you heard him say that? reporter: at the same time, brown is trying to paint worn as antibusiness. adding that her support for president obama's claims of you didn't build that. >> if you build a factory, good for you. you moved your goods to market on the roads the rest of us pay for reporter: warren is happy to amplify the most progressive rhetoric, hoping to win back democrats embraced her and 2008. reporter: massachusetts is one of the races who will control who earns the senate. the latest poll has drawn up by five points. but elizabeth warren has a substantial leading fundraiser. there have been some rocky moments in one's campaign.